Quote:
Originally Posted by shilpa
Will putting a good "normal" exhaust/muffler setup to the back allow the engine to breath as much (or almost as much) as the side pipes? I would imagine a really good set up would allow the engine to breath just fine....
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You are correct, it is possible to build an exhaust system that won't cost you horsepower and still gets the car to a legal sound level.
A rough rule of thumb is you need about 2.2cfm of muffler airflow for every engine hp. Dynomax has cfm ratings for their mufflers on their homepage:
http://www.dynomax.com/assets/2008ca...superturbo.pdf
Place the muffler as far away from the engine as possible. This will allow the exhaust gases to cool down what actually decreases their volumetric flow rate because the density changes with temperature.
You should also try to follow the guidelines for pressure wave tuning as outlined here (one of the best articles about exhaust design I know):
Auto Exhaust Science